It’s time to pick a side in this battle of super technology and super cuteness.

Through the years, Japan has given us hundreds of awesome robots and cute animal mascot characters, but no two have left their mark on history like Gundam and Hello Kitty have. So naturally, it’s now time for the two pop cultural icons to do battle with each other.

As a two-pronged celebration for the Gundam franchise’s 40th anniversary and Kitty-chan’s 45th birthday, the Gundam vs. Hello Kitty Project has launched, and the project’s organizers are now asking each and every one of us to choose between pledging our loyalty to the Sanrio star or metallic hero of the Earth Federation.

▼ While many mobile suits have had the “Gundam” designation, this showdown is specifically between the original RX-78-2 Gundam and Kitty White.

To sign up for Team Gundam or Team Kitty, first befriend the Gundam vs. Hello Kitty official Line messaging app account, then select which side you want to join. Be careful, though, because once you’ve made a decision, there’s no way to switch sides, so your oath of fealty is for life (or at least until the promotion ends).

▼ The official website even has two layouts, one for Gundam fans…

▼ …and the other for Kitty supporters.

However, since Hello Kitty doesn’t have conventional combat capabilities, this isn’t a shooting war so much as a popularity contest. Once you’ve joined a team, you can earn points by visiting participating shops and restaurants, with extra bonuses for making purchases there. Periodic rankings will reward players with higher scores with prizes such as tickets to fan events, merchandise, and stamps and wallpapers for use with the Line app. The participating merchants will change monthly, with the first batch set to be udon noodle chain Marugame Seimen and grocery/department store Itoyokado.